The following items can be farmed from the ghost pandas on TI:
Bubbling Pi'jiu Brew
Thick Pi'jiu Brew
Misty Pi'jiu Brew
Each produces a ghost panda that will fight for you for ten minutes. These can be
used anywhere in the world currently, though not in instances. Brawler's guild appears
not to count as an instance. You can have all three up at the same time.
This in itself is a significant dps increase.
However, you can make it much more effective with the cracked talisman
(credit to beck3210, link here:
http://www.ownedcore.com/forums/worl...-item-bug.html (Immunity Item Bug))
which makes you immune to all damage for a minute.
The cracked talisman can also be used in brawler's guild-at first glance I thought it was
fairly useless because you can't attack or cast spells but it turns out that you can
summon the pandas while in the invulnerable state.
Additionally, you can call up your imp, elemental, hunter's pet etc etc to do additional
dps.
Finally, there are several trinkets such as terracotta fragment, or crate of kindnapped
puppies, which summon pets to fight for you. All in all, you can have numerous pets
fighting for you while you yourself are invulnerable.
Because the BG opponents take a lot of dps to take down, you probably want to use
the talisman and the pets when you are near death having blown all your cooldowns.
Much the same strategy can be used when fighting rare elites. The main difference is that
you can use the ghost pandas TWICE, here's how:
Summon them, funk around for nine minutes, the cooldown on the brews is ten minutes.
Send your ghost pandas at the rare, if they die you can summon more when the cooldown
is up immediately afterwards.
To a lesser extent the same strategy can be used to make it easier when fighting world
bosses with a raid group.